Cash vs HELOC for brrrrr strategy

[Jorge Leon Jr]

Hello again BP members

I have recently discovered how to pick up not so bad REO SFR's to flip and rent out (or flip and sale .. not my thing though) with basically using the brrrr method

My question is more of which is better scenario to be in

if to pay down my primary residence and then have (easy numbers) 100k available in HELOC money

Or have 100k cash money laying there

And then after having such funds available (easy theoretical numbers)

Go out and Find a REO SFR for 50k

Needs 25k in repairs

Appraises and ARV comes back at 100k

And will rent out for 1400-1200 a month

Cash out finance 75k (75% LTV)

Pay back your self or heloc

And repeat process over

Now my immediate goal is to reach 15k PASSIVE income but i want opinions on how to get there faster 

and with this idea i have seen a few examples of in older threads but not alot

Thanks in advance!

PS: i know cash is king but still paying a mortage vs short term HELOC interest rates and ability of rinse and repeat...